BATTERY CHARGE AND DISCHARGE CONTROL SYSTEM AND BATTERY CHARGE AND DISCHARGE CONTROL METHOD

A control system (100) includes a state-of-charge (SOC) measurer (130) and a controller (140). The SOC measurer (130) measures states of charge of first and second battery packs (110, 120). The controller (140) adjust the SOCs of the first and second battery packs (100, 120). When a difference between the SOCs of the first and second battery packs (110, 120) is equal to or less than a first threshold value, the controller (140) adjusts the SOCs of the first and second battery packs (110, 120) so that the difference between the SOC of the first battery pack (110) and the SOC of the second battery pack (120) is equal to the first threshold value. An average of the SOCs of the first and second battery packs (110, 120) before the adjustment is equal to an average of the SOCs of the first and second battery packs (110, 120) after the adjustment. The controller (140) pulse-charges or pulse-discharges the first and second battery packs (110, 120) with a first C-rate.